Analyzing Wavef
orms
Histogram Measurements (cont.)
Measurement Description
Mean ±3 Std Dev Displays the percentage of points in the histogram that are within three standard deviations of
the histogram mean.
Communication Measurements
Measurement Description
Ext Ratio
The ratio of eye top to base. T his measurement only works for w aveform database or a reference
waveform saved in waveform database mode.
Ext Ratio % The ratio of eye base to top expressed as a percentage. This measurement only works for
waveform database or a reference waveform saved in waveform database mode.
Ext Ratio (dB) The ratio of eye top to base expressed in decibels. This measurement only works for waveform
database or a reference waveform saved in waveform database mode.
Eye H eight
The measurement of the eye height in volts.
Eye Width
The measurement of eye width in seconds.
Eye Top The top value used in the extinction ratio measurements.
Eye Base The base value used in the extinction ratio measurements.
Crossing % The eye crossing point expressed as a percentage of eye height.
Jitter P-P
The peak-to-peak value for the edge jitter in the current horizontal units.
Jitter RMS The RMS value of the edge jitter in the current horizontal units.
Jitter 6 Sigma Six times the RMS value of the edge jitter in the current horizontal units.
Noise P-P
The peak-to-peak value of the noise of the top or base of the signal as specified by you.
Noise RMS The RMS value of the noise of the top or base of the signal as specified by you.
S/N R atio The r atio of the signal amplitude to the noise of the top or base of the signal as speci fied by you.
Cyc Distortion The peak-to-peak time variation of the first eye crossing measured at the Mid Ref as a percent of
the eye period.
Q-Factor The ratio of eye size to noise.
Customizing an Automatic Measurement
You can customize automatic measurements by using gating, modifying measurement statistics, or adjusting the
measurement reference levels.
84 DPO7000 Series and DPO /DS A70000/B Series Quick Start User Manual
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